When I make horns for customers or myself, I always make the spout plug shortly after the hole is drilled. Then I put it in a jar of bear oil (vegtible or olive oil will alos work) and leave it there till it sinks. (Ususally in a couple of days) Pull it out, wipe it off and put in the horn. (May have to be shaved down just a touch to fit right) but you NEVER have to worry about it swelling from moisture and getting stuck or worse yet, splitting the spout!

Good idea! I'd imagine it also makes the plug slightly sticky and prevents shrinkage, both of which would help keep it from falling out, and would also help in sealing out moisture. I'll have to try this. I might even do it with my base plug.

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